One of the basic assumptions of the author’s gradient-factor theory of insect morphogenesis is that the effects of the hypothetical gradient-factor on tissue growth can be reproduced by the juvenile hormone, not only during postembryonic development, but also in the course of embryogenesis (Novák, 1951 a, b, 1956, 1966). This concept was originally based on the more or less indirect evidence supplied by the findings of Pflugfelder (1947) in Dixippus morosus and by those of Novak (1951 b) in Oncopehus fasciatus.

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